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| author | Kairui Song <kasong@tencent.com> | 2024-10-02 00:06:24 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-10-17 16:21:26 +0300 |
| commit | 3714f62ecb2b5f82ca61453d1f51a9f7d2a3392f (patch) | |
| tree | a687fe37946e46a25a4f6619fb339e49b7cf3c2c /include/linux/xarray.h | |
| parent | 0e7877d1bb5129e63fa9f932eae95d3d7b33c520 (diff) | |
| download | linux-3714f62ecb2b5f82ca61453d1f51a9f7d2a3392f.tar.xz | |
lib/xarray: introduce a new helper xas_get_order
commit a4864671ca0bf51c8e78242951741df52c06766f upstream.
It can be used after xas_load to check the order of loaded entries.
Compared to xa_get_order, it saves an XA_STATE and avoid a rewalk.
Added new test for xas_get_order, to make the test work, we have to export
xas_get_order with EXPORT_SYMBOL_GPL.
Also fix a sparse warning by checking the slot value with xa_entry instead
of accessing it directly, as suggested by Matthew Wilcox.
[kasong@tencent.com: simplify comment, sparse warning fix, per Matthew Wilcox]
Link: https://lkml.kernel.org/r/20240416071722.45997-4-ryncsn@gmail.com
Link: https://lkml.kernel.org/r/20240415171857.19244-4-ryncsn@gmail.com
Signed-off-by: Kairui Song <kasong@tencent.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Stable-dep-of: 6758c1128ceb ("mm/filemap: optimize filemap folio adding")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/xarray.h')
| -rw-r--r-- | include/linux/xarray.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/xarray.h b/include/linux/xarray.h index 44dd6d6e01bc..0e2feb72e9e5 100644 --- a/include/linux/xarray.h +++ b/include/linux/xarray.h @@ -1530,6 +1530,7 @@ void xas_create_range(struct xa_state *); #ifdef CONFIG_XARRAY_MULTI int xa_get_order(struct xarray *, unsigned long index); +int xas_get_order(struct xa_state *xas); void xas_split(struct xa_state *, void *entry, unsigned int order); void xas_split_alloc(struct xa_state *, void *entry, unsigned int order, gfp_t); #else @@ -1538,6 +1539,11 @@ static inline int xa_get_order(struct xarray *xa, unsigned long index) return 0; } +static inline int xas_get_order(struct xa_state *xas) +{ + return 0; +} + static inline void xas_split(struct xa_state *xas, void *entry, unsigned int order) { |